This Coimbra based research team also determined that 'Hotei' and 'Lem's Cameo' are diploids.

Rhododendron 'Nancy Evans' is seed fertile but pollen sterile.

'Nancy Evans' is the seed parent of 'Horizon Monarch', which was determined to be a tetraploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. This indicates that 'Nancy Evans' may occasionally throw unreduced gametes.